The biggest, most sophisticated robotic explorer ever built.The rover examines a rock on Mars with a set of tools

This artist concept shows NASA’s Mars Science Laboratory Curiosity rover, a mobile robot for investigating Mars’ past or present ability to sustain microbial life. Curiosity is being tested in preparation for launch in late 2011. In this picture, the rover examines a rock on Mars with a set of tools at the end of the rover’s arm, which extends about 2 meters (7 feet).

Two instruments on the arm can study rocks up close. Also, a drill can collect sample material from inside of rocks and a scoop can pick up samples of soil. The arm can sieve the samples and deliver fine powder to instruments inside the rover for thorough analysis.